I'm not sure what to think of this. My diffusers are home-made with about 25 pounds of concrete as a base (12x12x5 approx.) and the diffuser are about 20 inches off the bottom. I have always kicked up sediments and muddied the water a little bit, the air only ran at night and would be less clear in the morning compared to the evening. Aeration was put in during early/mid summer. I will check this weekend and see if any of the diffusers have fallen over and contemplate adding pans and/or elevating them more.
I have always told myself that the more turbid water was "natural dye". Hmmm, I hate to loose that, but clearer water would be nice!
